Can muscle fatigue in women be influenced by knee extension tasks in different ranges of motion?

Le résumé fourni par la source

Purpose The present study aimed to compare the strength performance in the one-repetition maximum (1RM) test with a knee extension machine among different ranges of motion (ROMs), and to compare the force reduction after the performance of a dynamic exercise configured with different ROMs. Methods Nine women (mean ± standard deviation: age: 24.2 ± 3.5 years; height: 166.5 ± 4.1 cm; body mass: 68.35 ± 4.14 kg) with no strength training experience and no history of injury performed (cross-over design) tests of 1RM with a knee extension machine in the following ROMs: 100–65° of knee flexion (INITIALROM), 65–30° (FINALROM), and 100–30° (FULLROM) (0° = knee full extended). Further, the volunteers performed, in each ROM, 3 sets of 7 repetitions at 60% of 1RM (specific to ROM assessed) with 3-minute rests between sets with 2 seconds for concentric and eccentric phases. Before and 2 minutes after the training, the maximum torque values at 100° and 30° of knee flexion were registered to calculate the force reduction. Results The ANOVA test identified that the maximum torque pre-training values were greater than the post-training values (p = 0.02), and a greater torque reduction occurred at 30° of knee flexion than at 100° (p = 0.001). Conclusions The results suggest that ROM may influence maximum strength performance, and the force may reduce similarly along the angles.

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